使用 lodash 對一組對象進行排序：不起作用

Question

我有一個看起來像這樣的數組（它有更多的對象，但結構是相同的）：

[
  {
      especiality: "surgery",
      users: [
          {
              id: "182",
              country: "Colombia",
              province: "Bogota",
              telephone: "211112212",
              neighbourhood: "La Santa"
              region: "South",
          },
          {
            id: "182",
            country: "Venezuela",
            province: "Caracas",
            telephone: "322323333",
            region: "North",
        },
        {
          id: "183",
          country: "Brasil",
          telephone: "23232333",
          neighbourhood: "Santos"
          region: "South",
      },
      ]
  },

如果 ID 相同，我希望地址組成一個數組（我需要映射這些元素）。 前景應該是這樣的：

user: [{id: 182, locations[(if they exist)               
              country: "Colombia",
              province: "Bogota",
              telephone: "211112212",
              neighbourhood: "La Santa"
              region: "South"], [country: "Venezuela",
            province: "Caracas",
            telephone: "322323333",
            region: "North"],}]

我目前正在嘗試這個，但它根本不起作用：

getGroups = test => {
  _.chain(test)
  .groupBy("id")
  .toPairs()
  .map(item => _.zipObject(["id", "country", "province", "neighbourhood", "region"], item))
  .value();
  return test
  }

我做錯了什么，我如何解釋可能並非在所有對象中都可用的值？

Answer 1

按id對項目進行分組后，映射組，並創建一個以id為對象的對象，該組的項目為locations 。 映射位置，並使用_.omit()從中刪除id 。

我不確定您想如何處理外部數組。 我使用_.flatMap()來獲取單個用戶數組，但是如果您需要維護原始結構，則有一個注釋選項。

 getGroups = test => _(test) .groupBy("id") .map((locations, id) => ({ id, locations: _.map(locations, l => _.omit(l, 'id')) })) .value(); const data = [{"especiality":"surgery","users":[{"id":"182","country":"Colombia","province":"Bogota","telephone":"211112212","neighbourhood":"La Santa","region":"South"},{"id":"182","country":"Venezuela","province":"Caracas","telephone":"322323333","region":"North"},{"id":"183","country":"Brasil","telephone":"23232333","neighbourhood":"Santos","region":"South"}]}]; const result = _.flatMap(data, ({ users }) => getGroups(users)); /** maintains the original structure const result = _.map(data, ({ users, ...rest }) => ({ ...rest, users: getGroups(users) })); **/ console.log(result);

 <script src="https://cdnjs.cloudflare.com/ajax/libs/lodash.js/4.17.11/lodash.js"></script>